Screen shots because it's not a comment, so I can't copy paste 😂

I'm also gonna go a little harder on this one because it's your Sona, so I have higher expectations 😁

His appearance is nice! I like the colors, but I'm not sure why but I feel like he's missing something...

Name: Tidalwave
Ok pretty standard Seawing, but not too common.
Age: 18 years
Decent
Gender: Male
Ok
Sexuality: Heterosexual
Ok
Crush: Coraltail
Interesting
Tribe: Seawing
Ok

Ok, his personality isn't bad, but it's pretty flat. There's some characteristics I like, but I feel as though he could use a little more. Maybe a few more negatives to balance him out.

Ok pretty good! I think the "doing the right thing" is a little basic and sounds bland. If he's the type of character who really does push to make the right decision, which is the vibe I'm getting from him, then maybe word it a little differently so it doesn't sound as stereotypical. Like for example, "He's intent on serving justice." Or "He takes into consideration what the morally right thing to do is, before taking action." If you find these too fancy, that's ok too. You can stick to what you already have, but consider changing the wording. It adds more depth into your character and gives them more life.

I'm a little confused, but I think reading the backstory first will help make more sense. Ok so I was right. I think this is good. Makes sense, but the way it's worded is a tab bit weird, so maybe just look over that. Also, adding a little bit of explanation on why he feels that way would be nice. You don't need a paragraph, and most things are self explanatory, but a small sentence of why Queen Coral is mad EX: "He dislikes Queen Coral due to his unpleasant history with her and her daughter." Would be great! Or just a (see backstory) would be fine as well. Other than that, no complaints :3

Ok so, the story is a little on the basic side. I like the basis of it, it just needs some fine tuning. I do have a pet peeve with using canon characters in OC story's/ backstory's or anything like that. Because the character is canon, I feel like it's out of bounds to be used because it makes the story, at least to me, seem a little less "realistic" if that makes sense. The only thing I would change is give the Seawing Queen a non canon name and make her separate from the canon world. With a little fine tuning, I think he could be spectacular!

Overall I give him an 85/100. He's a great character, but I expected a lot more due to him being a sona/main OC. Some parts of him were a little flat, but what he really needs is for you to just go over him again and really fine tune him and give his story more meat.
I enjoyed him, and hope to see him again soon!